smelting gold bars with the guantlets from family crest is decent xp per bar at either edge of neitiznot furnaces.
if u have brawlers from pvp smithing either mithril or addy bars into either bolts, plates, or other useable/sellable (check the ge database pages for ideas) things out at the couple of anvils out in the wilderness on a pvp or bh world would be amazing xp. specially when coupled with sacred clay hammers from stealing creation.
sacred clay hammers = 2x regular xp per bar.
Runescape wrote:
Brawling Gloves (Members Only)
Brawling gloves are especially designed to temporarily increase the experience you earn while training on a PvP world. While wearing them, you will receive a 50% bonus to any experience you earn in the relevant skill while on a PvP world. If you use them in the Wilderness on a PvP world, you will receive even more - quadrupling the amount you would normally receive.
Brawling gloves don't last forever, and will disintegrate after a certain amount of time spent earning the relevant experience.
^the only downside is the brawling gloves are never kept on death.
however to the best of my knowledge the hammers and gloves bonuses do stack with each other.